Apparatus for manufacture carbid.



No. 888,610. yPATLNlEIi MAY 26,"j-1;908.

A Y H. L. HARTBNSTEIN.

:APPARATUS FUR MANUFACTURING GARBID.

APPLIOATION FILED Novftmfwbe.

N0.s8a,61o. Y PATENTBDMAY26,1908. .4 H. L. HARTENSTEIN. i yMPPARATUS POR MANUFACTURING GARBID.

APPLICATION FILED NOV. 30, 1906.

2 SHEETS-SHEET 2.

WMW

HERMAN L. HARIENSTEIN, OF CONSTANTINE) MICHIGAN.

APPARATUS FOR MANUFACTURING CARBID.

Specification of Letters Patent.

Patented May 26, v1908.

'Application led November 30.y 1906. Serial No. 346,751.

To all whom it may concern:

Be 1t known that I, HERMAN L. HARTEN- STEIN, a cltizen of the United States, residing at Constantine, in the county of St. .Joseph and State of- Michigan, have invented certain new and useful Improvements in Apparatus for Manufacturing lowing is a full, clear, and exact specification.

AThis invention relates to means for the proper treatment of calcium carbonate and carbon, or carbonaceous materials, for the pro duction of calciumcarbid.

The improvements are directed more particularly to economizing the heat necessary for the conversion of the elements and the production of the superior rade of carbid.

The primary object of t e invention is to provide improvedv 'and efiicient means for.

roducing calcium carbid of a superior quality with the minimum expenditure of heat. f

Another ob'ect of the Invention is .to'pro-Z v1de improve means inthe manufacture of" carbid whereby the lime resulting from calcining the calcium carbonate will be discharged from the calcining furnace at substantially the hottest point thereof, whereby the greatest number of heat units may be saved from those employed in such calcination and utilized in the subsequent treatment of the calcium carbid producing elements.

Another object of the invention is to provide improved means whereb the gas evolved in the electric furnace ornarily employed in apparatus of this character for fusmg the ingredients, may be utilized for heating or burning the limestone or calcium carv bonate.

vWith a view to the attainment of these ends, and the accomplishment -of certain other objects, which will hereinafter appear, the invention consists in the features of novelty which will now be described with reference to the. accompanying drawings, and more particularly pointe out in the clsaims.

In the said drawings,.-Figure 1 is a di'agrammatic illustration of a plant or apparatus embodying this invention, thesame being in side view orelevation. Fig. 2 is an enlarged 'detail' side elevation, partly broken away and in section, of a conveyerand heating jacket,

hereinafter described. Fig. 3 is a p an view of the devicesl s hown in Fig. 1, certain parts, hereinafter described, omitted for the sake of clearness. And Fig. 4 is an enlarged detail Carbid, of Which the fol-4 longitudinal sectional view of a portion of the calcining furnace orxkiln hereinafter described.

The limestone or calcium carbonate employed in the manufacture of calcium carbid is introduced into one or more rotary kilns 1, 2. In this exemplification of the invention two of these kilns are shown as arranged in parallel relation for convenience of feeding an operation, but it will of course be understood that the number is entirely immaterial. Each of these is in the form of an elongated cylindrical chamber or tube,'arranged in a slightly inclined position so as to encourage the downward feeding or travel of the limestone as it rests upon the bottom thereof. They maybe given the desired rotary motion by any suitable or well .known means, such as ian encircling gear Band a pinion 4 driven by shaft 6 from any suitable source of power, the* cylinder being supported by bearing bands 7, 8, on suitable pillows 9, 10. The

``1naterial to be calcined, and which is preferably previously pulverized or groundis introduced into bins or hoppers 11, 12, arranged at the upper ends of the kilns 1., 2. These bins are respectively provided with any suitable means for feeding the material into the kilns, the means shown being a screw-.conveyer 13, which conveys the material from the bin and discharges it into another screwconveyer 14, serving toconduct it directly into the mouth of the kiln, but the particular means employed for this purpose is not material, and any other arrangement might be used.

As the material works downwardly in thekiln it is subjected to a hot blast. sup lied to the'kiln at the lower end thereof. n vthis example of the invention this blastiis created by burning gas in aheanth` or *combustion chamber 15, which is situated -at the lower end of the kiln, and is preferably cylindrical like the kiln, but instead of being rotatable is stationary and fixed upon any suitable suports 16 in such a relation to the end of the iiln that the products of combustion generated in the furnace will discharge directly into the kihi. ,This combustion chamber is supfplied with gas fro-m any suitable source, suc as a gas-producer 17, one of which may be employed for each ofthe furnaces orcombustion chambers L5, and connectedthereto lby theusu'al connections 18, 19, 20, em loyed in gas-producers of this character. T e calcining material or lime produced bythe action of the heat on the calcium carbonate in the rotary kiln eventually finds its way to a discharge aperture 21 located at the lower 5 end of the kiln and at the inner end of the combustion chamber 15. This discharge aperture is Vpreferably formed in a separate housing22, which is fixed against rotation, like the combustion chamber 15, and into which the end of the kiln 1 is rotatably fitted lso as to produce as close a joint as possible, the interior of the housing 22 being so formed that the 4bottom thereof will be substantially level, or slightly inclined downwardly from the bottonr'of the combustion chamber, so as to avoid any tendency of the material to pass beyond the discharge aperture 21 and enter the combustion chamber 15. For the sake of convenience in handling or manipulation when it is desired to make repairs, inspection,

etc., the housing 22 may be mounted on a truck 23, whereby it may be rolled out of the` way, when one of the other parts contiguous thereto is removed. l,

The length ofthe combustion chamber 15 is so pro ortioned withrespect to the strength of the raft passing therethrough, and to the volume of fuel being consumed, that the point of most perfect combustion will take place substantially at the point where the discharge aperture 21 is situated, it of course y being understood that the point of perfect combustionis considerably inward beyond the point where the combustible elements are introduced into the combustion chamber,

and as a consequence the calcined materialv or lime will be discharged from` the calcining furnace or vkiln at the hottest pointv thereof'. From the discharge aperture 21 the lime or calcined product falls into' a `hopper 24 situated thereunder, preferably one for 'each of the furnaces, and from this it is discharged at will past a controlling gate or valve 25 into a weighing machine 26, to determine the amount being introduced into the mixer 27, usually em loyed in this art for mixing the lime with tie carbonaceous material, which latter is also weighed by a weighing machine 28, arranged to discharge into the mixer 27, and to receive its supply of coke or carbonaceous material through a valve spout 29 from a hopper 30. From the mixer 27 the comniingled ingredients are conducted to the fusing furnaces, where they are subjected to a fusing degree of heat. usually electrical, and in this instance are illustrated as such at 31, 32, any suitable number of these being employed in the same lant. By the treatment of lime and carbonaceous material in these furnaces, a com- I bustible gas, i. e.,carbon monoxid,is evolved,

and it is one ofthe purposes of this invention to utilize this gas in heating the calcining kilns `1, 2. Tn this exemplification of the in- 55 vention the said result 1s accomplished by These furnaces are connecting the uptakes 33 of the electric furnaces witha mainv or manifold pipe 34, which may be provided with an exhauster 36 for drawing the gases out of the furnaces 31, 32, and forcing'them into the pipes 20 leadingfrom the gasproducers 17, so that this gas from the electric furnaces will be discharged along with the gas from the producers 17 into the combustion chambers 15,

`a suitable quantity of air, of course, being admitted at the same time to su port combustion. It is of course desirab e that the temperature of this combustion-supportingair be raised as high as possible prior to the time of ignition, and in order that this may be done economically the waste heat and gases generated in the rotary kilns 1, 2, are utilized for that purpose. A

By reference to Fig. 1 of the drawing it will be seen that the upper ends of the rotary kilns 1, 2, open into a breeching or chamber 37, which is provided with a stack or up-take 38, whereby the heat and gases from the kilns 1, 2, may be discharged into the atmosphere if desired, and this chamber or breeching 37 is also'provided with an outlet 39,. communicating with a manifold drum 40, which serves to connect the two chambers one of these being provided foreach of the kilns l, 2, to a pipe or flue 41, connected at its upper end to'a horizontal chamber 42 having 'a stack or up-take 43 at its end remote from the flue 41. This horizontal chamber 42 isincased in an air-jacket 44, open at its right-hand end as viewed in Fig. 2 and provided at its left-hand end with a discharge flueA 45 having an exhauster 46, serving to draw the air through the jacket 44 and force it into the flues 20 through branch pipes 47, 48.` The up-take 3l`-is rovided with a dam er or valve 49, which 1s closed when it is desired to force the waste heat from the kilns 1, 2, through the chamber 421, and the flue's or pipes 39,41, are provided with dampers 50, 51, respectively,"which may be closed when it is desired to shut 0H the waste heat from one or moreof the Vkilns 1, 2, and compel i-t tol rise through the uptake 38. By this means it will be seen that fresh air may waste heat and gases from these kilns, without becoming contaminated and its combustibility destroyed by the carbonio acid gas evolved in the kilns 1,v 2.

be drawn into the combustion chambers 15', heated to a high degree by the lio In order that the coke or carbonaceous Y the kilns 1, 2.

bonaceous materialis also accomplished by the Waste heat andxgases .discharging from As shown in Fig. 1, the horizontal chamber 42 is provided with ahorizontal endless' conveyer 52, which may be of any suitable construction, provided with pockets 53, or other means for carrying the material, and so constructed and arranged as to receive the material at one endl and automatically discharge it at the other end into the hopper or bin 30. The conveyer is thus supplied with material from any suitable source bya conveyer 54 having a discharge-spout 55 empty- ,ing into the pockets of the conveyer 52, which are situated directly within the chamber 42 containing the hot gases and fumes from the kilns l, 2, which thus serve to simultaneously heat the contents of the conveyer 52 and the air-jacket 44 Without any of such non-combustible gases being allowed to enter the air in-takes of the combustion chambers.

The calcined material being discharged from the calcining furnace 4at the point Where most perfect combustion4 occurs, it will be seen that it enters'its receiving hopper 24 while containing the greatest possible number of heat units employed in its conversion into lime, and as a consequence none of this heat is lost, as would be the case if the calcined material were compelled to travel .onward through the combustion chamber 15 before discharging. The material having been discharged into the hopper or bin 24, is weighed and mixed with the carbonaceous material, which is also heated to a high degree as before described, and the tWothus commingled are conducted into the electric furnaces with all possible despatch and while in a highly heated condition, so that the lime will no't be given an opportunity to deteriorate under the atmospheric influences or of absorbing carbonic acid gas or moisture, nor will the degree of temperature gained in its conversion into lime be lost and a correspondingly greater degree of temperature in the electric furnaces required to fuse the mixture.

In order that the invention may be understood by thosel skilled in the art, the details of this embodiment thereof have been thus specifically described, but

What I claim as new therein and desire to secure by Letters Patent is:

' 1. In an apparatus for' the purpose described, the combination of a calcining furnace, means for supplying said furnace with a fuel element, an air heating chamber disconnected from said furnace and arranged.

to be heated by the Waste gases therefrom, and means connecting said air heating chamber with the air in-take of said furnace for supporting combustion therein.

2. In an apparatus for the purpose described, the combination of a calcining furnace having a gas and air inlet, an air heating chamber disconnected from said calcining furnace and arranged to be heated by the Waste gases therefrom, connected with said air inlet, an electric furnace adapted to evolve combustible gases, and means for conductingsaid combustible gases to the gas inlet of the calcining furnace.

3. In an apparatus for the purpose described, the combination of a calc-ming furnace, a chamber arranged to receive the Waste gases from said calcining furnace, an air heating jacket surrounding said chamber and connected with the in-take of the calcining furnace for supporting combustion therein, and means for supplying the calcining furnace with combustible fluid.

4. In an apparatus for the purpose described, the combination of a calcining furnace having air and gas in-takes, a chamber connected with the calcining furnace for receiving the waste gases therefrom, a conveyer in said chamber whereby the materia-l contained in the conveyer will be heated by said Waste gases, an air heating jacket arranged in operative proximity to said chamber, and means connecting said air heating jacket with the air intake of the furnace.

5. In an apparatus for the purpose described, the combination of a calcining furnace for producing lime, means for mixing said lime with a carbonaceous material adapted to receive the lime from said furnace, and a holder or bin for said carbonaceous material, a conveyer for conducting the carbonaceous material to said bin, and a' heating chamber inclosing said conveyer and communicating with the calcining furnace for -receiving the Waste gases therefrom. Y

6. In an apparatus for the purpose described, the combination of a calcining furnace having an air inlet for supporting combustion therein, a vconveyer for conveying material to be mixed with the material calcined in said furnace, a chamber inclosing said conveyer and communicating with the calcining furnace f or receiving the Waste gases therefrom, and an air jacket arranged in operative proximity to said conveyer chamber and communicating with the air intake of the furnace.

7. In an apparatus for the manufacture of calcium carbid, the combination of a, calcinlng furnace having a combustion chamber at one end, and a4 discharge aperture for the calcined material located-at a point remote from the intake end of the combustion chamber and at the point of highest temperature in the furnace.

8. In an apparatus for the manufacture of calcium carbid, the combination of a calcining furnace embodying a combustion chamber having an air inlet for su )porting combustion and a gas inlet for suppfying the combustion chamber with fuel, an electric two subscribing witnesses, on this 23rd day furnace closed agailnst the admisslion of of November A. D. 1906. :it-mos heric air, an( beinor inde ien( ent of 1 f T such saleining furnace 'ard hailing a gas HERMAN L HAR FENSTLIL 5 outlet connected-With said gas inlet. .Vitnesses:

In testimony whereof I have signed my FRANCIS A. HOPKINS, naine to this specificatiomin the presence of CMAS. II. SEEM. 

